12
9.1
O
VERALL
V
IEW
1
2
3
4
5
6
8
10
11
13
14
7
15
16
18
12
19
17
9
21
20
22
23
24
25
F
IG
. 9.1
1
. - sheet steel casing
2
. - pressurised expansion tank
3
.- sealed casing
4
. - burner/exchanger assembly
5
. - 24 V fan
6
. - air/gas connection assembly
7
. - ignition electrodes
8
. - flame detection electrode
9
. - stainless steel Domestic hot water tank
10
. - circulation pump
11
.- electronic control unit
12
. - ignition transformer
13
.- overheat cut-off
14
. - gas valve
15
. - tank sensor
16
. - heating outlet sensor
17
. - heating return sensor
18
.- distributor valve
19
. - stainless steel plate Domestic hot water
exchanger
20
. - Domestic hot water flow rate controller
21
. - Domestic hot water sensor
22
. - silencer
23
. - siphon
24
. - Domestic hot water expansion cylinder
25
. - pressure switch